A new kind of machine【C1】________to take the place of humans. These【C2】________can do jobs that are too dangerous for humans.【C3

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问题     A new kind of machine【C1】________to take the place of humans. These【C2】________can do jobs that are too dangerous for humans.【C3】________, they are being developed to work in nuclear power centers, deep waters and outer space.
    This is how the new machines【C4】________. A machine is placed in an area far away from the person who controls it. The person【C5】________a special hard hat with a tiny television screen. The screen【C6】________the person to see and hear exactly what the machine is seeing and hearing. This gives the person the feeling of【C7】________in the same place【C8】________ the machine. The person controls the machine. The machine【C9】________the person’s movements exactly. If the person raises his right arm, the machine raises the right arm, too. This means a(n)【C10】________worker can do a dangerous job while staying in a【C11】________place. For example, a person can direct the machine【C12】________a bomb【C13】________going near the bomb himself.
    The new machines are not exactly【C14】________robots. Robots are controlled by a computer. The new machines are controlled by a person. The new machines are called teleoperators (遥控机器). The nuclear power industry is especially interested in teleoperators. The machines can solve the problem of【C15】________radioactive (放射性的) materials.
【C2】

选项 A、machine
B、machines
C、equipment
D、machine tool

答案B

解析 句意:这些机器可以做对人来说太危险的工作。此处是前一句中machine(机器)的原词复现。根据空前的These可知,此处应用其复数形式。equipment:设备,为不可数名词;machine tool:机床,工具机,为可数名词单数。故选B。
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